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USGS Daily Statistics for the Nation

The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 12031000 CHEHALIS RIVER AT PORTER, WA


Grays Harbor County, Washington
Hydrologic Unit Code 17100103
Latitude  46°56'22", Longitude 123°18'47" NAD27
Drainage area 1,294  square miles
Gage datum 0 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1952-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 8,230 9,500 7,160 6,160 3,150 1,610 857 434 446 818 2,710 7,460
2 8,050 9,200 7,150 5,680 3,020 1,630 832 432 439 845 2,780 8,240
3 8,120 8,760 7,100 5,290 2,940 1,680 814 430 444 764 2,810 8,990
4 8,180 7,970 7,050 5,080 2,930 1,640 794 424 448 745 2,880 9,540
5 8,520 7,530 6,970 5,000 2,970 1,570 767 419 442 786 3,200 9,650
6 9,140 7,460 6,870 5,110 2,930 1,500 740 414 455 786 3,210 9,090
7 10,200 7,640 6,820 5,260 2,850 1,460 719 411 478 806 3,450 8,650
8 10,700 7,770 6,730 5,160 2,740 1,450 700 412 458 792 3,570 8,100
9 11,000 8,080 6,750 5,070 2,600 1,420 689 417 441 871 3,540 7,810
10 10,600 7,800 7,160 4,990 2,460 1,430 685 408 447 1,060 3,460 7,750
11 10,300 7,390 7,650 4,860 2,360 1,460 674 396 481 1,070 3,620 8,280
12 9,950 7,180 7,640 4,800 2,260 1,440 660 389 472 1,060 4,110 9,070
13 10,000 7,240 7,540 4,860 2,190 1,420 646 384 462 1,050 4,660 9,370
14 9,810 7,280 7,520 4,930 2,140 1,340 643 382 453 1,050 5,140 9,260
15 9,730 7,280 7,460 4,950 2,120 1,300 632 382 458 1,050 5,530 9,440
16 9,810 7,750 7,480 4,830 2,110 1,270 618 380 481 1,060 5,450 9,340
17 9,920 8,290 7,150 4,630 2,100 1,230 605 379 536 1,100 5,440 9,170
18 9,950 8,630 6,630 4,400 2,050 1,180 585 376 585 1,130 5,670 8,990
19 9,970 8,800 6,210 4,160 2,010 1,140 566 374 599 1,200 6,100 8,630
20 9,790 8,760 5,870 4,090 1,980 1,120 552 374 597 1,350 6,820 8,570
21 9,520 8,670 5,780 4,100 1,950 1,090 541 377 610 1,530 7,120 8,750
22 9,360 8,380 5,750 3,890 1,890 1,070 529 387 598 1,660 7,210 8,880
23 8,930 8,090 5,730 3,770 1,850 1,040 516 388 589 1,750 7,440 8,770
24 9,070 7,870 5,850 3,870 1,820 1,010 504 405 604 1,670 7,570 8,460
25 9,610 7,710 5,990 3,890 1,750 987 491 423 602 1,640 8,110 8,190
26 9,590 7,590 5,970 3,730 1,690 962 480 439 582 1,780 8,770 8,060
27 9,610 7,180 5,870 3,570 1,640 932 470 447 576 1,960 8,470 8,100
28 9,240 6,980 5,840 3,530 1,620 903 463 439 592 2,130 8,020 8,360
29 9,230 7,490 5,840 3,470 1,630 896 454 435 680 2,170 7,460 8,490
30 9,260   6,210 3,290 1,630 884 446 440 787 2,310 7,130 8,550
31 9,340   6,400   1,570   439 451   2,440   8,580